Quantum thermal Hall effect of chiral spinons on a kagome strip

Pavel Tikhonov, Efrat Shimshoni

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3 Scopus citations

Abstract

We develop a theory for the thermal Hall coefficient in a spin-12 system on a strip of kagome lattice, where a chiral spin-interaction term is present. To this end, we model the kagome strip as a three-leg XXZ spin-ladder, and use bosonization to derive a low-energy theory for the spinons in this system. Introducing further a Dzyaloshinskii-Moriya interaction (D) and a tunable magnetic field (B), we identify three distinct B-dependent quantum phases: a valence-bond crystal (VBC), a "metallic" spin liquid (MSL), and a chiral spin liquid (CSL). In the presence of a temperature difference ΔT between the top and the bottom edges of the strip, we evaluate the net heat current Jh along the strip, and consequently the thermal Hall conductivity κxy. We find that the VBC-MSL-CSL transitions are accompanied by a pronounced qualitative change in the behavior of κxy as a function of B. In particular, analogously to the quantum Hall effect, κxy in the CSL phase exhibits a quantized plateau centered around a commensurate value of the spinon filling factor νsB/D.

Original languageEnglish
Article number174429
JournalPhysical Review B
Volume99
Issue number17
DOIs
StatePublished - 28 May 2019

Bibliographical note

Publisher Copyright:
© 2019 American Physical Society.

Funding

Useful discussions with Sam Carr, Eyal Leviatan, David Mross, Raul Santos, Eran Sela, and Chandra Varma are gratefully acknowledged. P.T. thanks the Bar-Ilan Institute for Nanotechnology and Advanced Materials for financial support during the academic year 2017. E.S. thanks the Aspen Center for Physics (NSF Grant No. 1066293) for its hospitality. This work was supported by the US-Israel Binational Science Foundation (BSF) Grant No. 2016130, and the Israel Science Foundation (ISF) Grant No. 231/14.

FundersFunder number
Directorate for Mathematical and Physical Sciences1066293
MacDiarmid Institute for Advanced Materials and Nanotechnology

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